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. If the computer is in suspend-to-disk mode and the display is open or an external monitor is connected, pressing the power button causes the computer to initiate the resume-from-disk operation. System Overview 1-5 ,QWHUUXSW$VVLJQPHQW. 7DEO. . ,QWHUUXS. $VVLJQPHQW. ,5. /LQ. 8VHG$YDLODEO. IRQ0 Generated by the system timer IRQ1 Generated by the keyboard controller to signal that the keyboard output buffer is full IRQ2 Generated internally by the interrupt controller to enable IRQ8 through IRQ15 IRQ3 Available for use by a PC Card unless the built-in serial port or infrared port is configured for COM2 (the default) or COM4 IRQ4 Available for use by a PC Card unless the built-in serial port or infrared port is configured for COM1 (the default) or COM3 IRQ5 Available for use by the audio controller IRQ6 Generated by the diskette drive controller to indicate that the diskette drive requires the attention of the microprocessor IRQ7 Available for use by a PC Card or audio controller if the built-in parallel port is disabled IRQ8 Generated by the system I/O controller’s RTC IRQ9 Generated by the video controller IRQ10 Available for use by a PC Card or audio controller unless the C/Port APR or C/Dock Expansion Station is attached IRQ11 Generated by the USB and PC Card controllers; available for use by a PC Card IRQ12 Generated by the keyboard controller to indicate that the output buffer of the integrated touch pad or external PS/2 mouse is full IRQ13 Reserved for use by the internal coprocessor IRQ14 Generated by the hard-disk drive to indicate that it requires the attention of the microprocessor IRQ15 Generated by the CD-ROM drive in the modular bay to indicate that the drive requires the attention of the microprocessor 1-6 Dell Latitude CP and CPi Service Manual 7HFKQLFDO6SHFLILFDWLRQ. 7DEO. . 7HFKQLFD. 6SHFLILFDWLRQ. 0LFURSURFHVVR. Microprocessor: Latitude CPi D300XT Latitude CPi D266XT Latitude CPi D233ST . . . . . . . . Mobile Intel Pentium II microprocessor 300, 266, or 233 MHz Latitude CP M233XT Latitude CP M233ST Latitude CP M233SD Latitude CP M166ST . . . . . . . . Intel Pentium microprocessor with MMX technology 233 or 166 MHz Bus architecture . . . . . . . . . . . . . . . PCI Internal cache memory . . . . . . . . .. 32 KB External cache memory: Latitude CPi D300XT Latitude CPi D266XT Latitude CPi D233ST Latitude CP M233XT Latitude CP M233ST Latitude CP M233SD . . . . . . . . 512 KB pipelined-burst SRAM Latitude CP M166ST . . . . . . . . 256 KB pipelined-burst SRAM Math coprocessor . . . . . . . . . . . . . internal to the microprocessor &KL. 6H. DQ. %X. System chip set: Latitude CPi D300XT Latitude CPi D266XT Latitude CPi D233ST . . . . . . . .. Intel 440BX PCIset Latitude CP M233XT Latitude CP M233ST Latitude CP M233SD Latitude CP M166ST . . . . . . . .. Intel Mobile 430TX PCIset Microprocessor data bus width. . . . 64 bits DRAM bus width . . . . . . . . . . . . . . 64 bits Address bus width . . . . . . . . . . . . . 32 bits Security EEPROM . . . . . . . . . . . . . 256 bytes Flash EPROM . . . . . . . . . . . . . . . . 2 Mbits Local bus . . . . . . . . . . . . . . . . . . . . 66 MHz PCI bus . . . . . . . . . . . . . . . . . . . . . 33 MHz System Overview 1-7 7DEO. . 7HFKQLFD. 6SHFLILFDWLRQ. FRQWLQXHG. 3. &DU. PC Card controller . . . . . . . . . . . . . Texas Instruments PCI1131 CardBus controller PC Card connectors . . . . . . . . . . . . two (supports type I and type II cards in any combination; supports type III cards only in the lower connector)1 Cards supported . . . . . . . . . . . . . . 3.3-V and 5-V cards PC Card connector size . . . . . . . . . 68 pins Data width (maximum): PCMCIA . . . . . . . . . . . . . . . . . . 16 bits CardBus . . . . . . . . . . . . . . . . . . 32 bits 0HPRU. Memory module sockets . . . . . . . . two Memory module type and capacities2 . . . . . . . . . . . . . . . . . . . 16-, 32-, and 64-MB 3.3-V EDO SODIMMs Standard RAM . . . . . . . . . . . . . . . . one 16-MB memory module or one 32-MB memory module Maximum RAM . . . . . . . . . . . . . . . 128 MB Memory access time: tRAC . . . . . . . . . . . . . . . . . . . . 60 ns tCAC . . . . . . . . . . . . . . . . . . . . 15 ns BIOS address. . . . . . . . . . . . . . . . . F000:0000–F000:FFFF &RQQHFWRU. Serial (DTE) . . . . . . . . . . . . . . . . . . one 9-pin connector; 16550-compatible, 16-byte buffer Parallel . . . . . . . . . . . . . . . . . . . . . . one 25-hole connector; unidirectional, bidirectional, or ECP Video . . . . . . . . . . . . . . . . . . . . . . . one 15-hole connector PS/2 . . . . . . . . . . . . . . . . . . . . . . . . one 6-hole mini-DIN (does not support more than one device at a time) 1 On systems using the MicrosoftWindows 95 or Windows 98operating system, a zoom video card canbe used onlyin the upper connector. The Microsoft Windows NT® 4.0 operating system does not support zoom video. 2 The Latitude CP and CPi do not support memorymodulesfrom previous models of Dell portable computers, such as the La...